Using Ethephon and GA3 to Overcome Thermoinhibition in `Jalapeño M' Pepper Seed

Abstract

<jats:p>`Jalapeño M' pepper (<jats:italic>Capsicum annuum</jats:italic> L.) seeds were soaked for 40 h in solutions of 0.0, 0.5, 1.0, 2.0, or 3.0 m<jats:sc>m</jats:sc> GA<jats:sub>3</jats:sub> (using Release, 10% GA<jats:sub>3</jats:sub>) and 0.0, 1.75, 3.5, 7.0, or 10.5 m<jats:sc>m</jats:sc> ethephon in all combinations in petri dishes at 25 °C. The seeds were rinsed, dried for 24 hours, then germinated at either 25 or 40 °C. Thermoinhibition was induced at 40 °C, as nontreated seeds failed to germinate, but 99% of the seeds germinated at 25 °C after 7 days. Pretreatment with H<jats:sub>2</jats:sub>O alone partially alleviated thermoinhibition at 40 °C (41% germination). Pretreatment with ethephon alone resulted in up to 50% germination and with GA<jats:sub>3</jats:sub> alone up to 79% germination. The effects of the GA<jats:sub>3</jats:sub> and ethephon were additive, as the highest germination percentage (91%) at 40 °C was obtained with 3.5 m<jats:sc>m</jats:sc> ethephon + 3.0 m<jats:sc>m</jats:sc> GA<jats:sub>3</jats:sub>. The percentage of abnormal radicles was &lt;1% in all treatments. Chemicals used: (2-chloroethyl) phosphonic acid (ethephon); gibberellic acid (GA<jats:sub>3</jats:sub>).</jats:p>

L-Triptofan ve Melatonin’in Düşük ve Yüksek Sıcaklık Koşullarında Turp ve Ispanağın Tohum Çimlenme Performansına Etkileri

“…Bu durumun, tohum kabuğundaki oksijen geçirgenliğinin azalması (Come and Tissaoui, 1973) veya sıcaklığın su alımı üzerindeki etkisi ile ilişkili olabileceği vurgulanmıştır (Gulliver and Heydecker, 1973). Bunun yanında yüksek sıcaklığın çimlenmeyi engelleyip termodormansiye neden olduğu birçok araştırıcı tarafından rapor edilmiştir (Hsiao, 1993;Bewley and Black, 1994;Carter and Stevens, 1998;Gonai et al, 2004).…”